Browse Prior Art Database

TECHNIQUES FOR ALIGNMENT IN A MULTI-ARRAY SCANNING SYSTEM

IP.com Disclosure Number: IPCOM000024381D
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 76K

Publishing Venue

Xerox Disclosure Journal

Abstract

A multi-array, solid state scanning system must be properly, spatially aligned in two critical directions in order to reduce the problems and costs associated with misalignment. These directions are ' in the fast scan direction (along the X-axis, i.e., tangential) and in the slow scan direction (Y-direction, i.e., sagittal), respectively. A misalignment of the former implies a loss of information in the tangential direction. A misalignment of the latter will necessitate a buffer storage for each scan line of sagittal misadjustment.

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XEROX DISCLOSURE JOURNAL

TECHNIQUES FOR ALIGNMENT IN A MULTI-ARRAY SCANNING SYSTEM Martin A. Agulnek

Proposed Classification
U.S. C1. 358/294 Int. C1. H04n 1/02

A multi-array, solid state scanning system must be properly, spatially aligned in two critical directions in order to reduce the problems and costs associated with misalignment. These directions are ' in the fast scan direction (along the X-axis,
i.e., tangential) and in the slow scan direction (Y-direction, i.e., sagittal), respectively. A misalignment of the former implies a loss of information in the tangential direction. A misalignment of the latter will necessitate a buffer storage for each scan line of sagittal misadjustment.

Initially, the arrays are coarsely aligned, the arrays being supported so that adjusting movements in the X and Y directions are available to obtain the required resolution. System optical constraints will result in some finite number of overlap bits, and a target such as an "X" in the designated overlap region could be helpful in making a coarse adjustment in the tangential direction while a straight line (with a thickness of a few scan lines) is helpful in making a coarse sagittal adjustment.

Data within a region somewhat larger than the desired overlap area is then collected over a large sample of scan lines for each overlapping array pair. An autocorrelation function is performed on the data for each overlap region. As the function sweeps across each overlap and down thru t...